Tomo Fukuya loves taking pictures of himself while cross-dressing, and he's gained some notoriety among his schoolmates because of it. He participates in his school's beauty contest during the school festival against his friend Kei Okabe.

Various oneshots based on theme of alcohol and yuri relationships.

One day while Shirou is delivering a secret device to his colleague, he meets Amane Mao, a super-strong girl capable of lifting cars. This device, the VITA system, is a new weapon theoretically capable of defeating ERRORs: a breed of enormous, cybernetic mutants that necessitated the use of weapons of mass destruction on Old Tokyo fourteen years ago.
Suddenly, one such ERROR appears before the two and goes on a rampage. Shortly after a failed argument to convince his colleague to approve use of the VITA system simply to save civilians, his colleague is devoured by the ERROR. Faced with death, Shirou has no choice but to accede to Mao's request to activate the super-weapon and destroy the ERROR.
...and thus Shirou's eventful days as the male master of the VITA system at St. Liddel's Girls' Academy are about to begin...
(Source: Edited from AnimeSigma)

Yuuichi Tate is overjoyed: He gets to go to a brand new high school. Of course, then he just happens to find out the school he choose is under frequent attack by strange creatures called ''Orphans'', and the school set up a special task force of female members called ''HiME''s, using various elements as their powers, to battle these invaders. That's not all, though. Each member of the HiME task force has their own, unique ''Key'', another person whom, upon being discovered, can team up with the HiME to create a ''Child'', a combative unit specifically needed to effectively battle these Orphans. And with Yuuichi's luck, he just happens to find out he's not just the ''Key'' for one of the HiMEs, but for two... Two highly competitive, rival schoolgirls. And that's only the start of the trouble.
(Source: Tokyopop)

A sequel to Mai Otome,which introduces Archduke Nagi's younger sister. Who is disguised as a man. Arashi (Nagi's sister) has bought Garderobe and all of its properties. The story starts from there.